Improvement in propeller-wheels



J. A. JOYNER. PROPELLER WHEEL.

Patented Dec. 28

i nited fitness aunt fli iiiiire.

- Letters Patent N 98,268, dated December 28, 1869; anted lted Decemb'er 18, 1869.

IMPROVEMENT IN PROPELLER-WHEELS.

The Schedule referred to in these Letters Patent and making part of the name.

To all wlzcm at may concern.-

Be itknown that- I, Jain-1s ALBERT Jorxnn, of the city of New York, in the county and State of New York, have invented a new and useful Improvement in Propeller-Wheels; and I' do hereby declare that the tbllmving is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being bad to the accompanying drawing, forming part oft-his specitication.

My invention relates to a new and important improvement in that class of propeller-\vhcels for marine vessels, which consists ot'a central hub and radial blade-s, surrounded by a band or cylinder; and

The improvement consists in substituting for the plain band or cylinder previously used, one whose ends are of unequal diameters, or which resembles in form the frust-mn ot' a hollow cone.

In theaccompauying plate of drawings- Figuve 1 is an edge view, with the eyeor hub broken away, or shown in section.

Figure 2 is a side view, showing the blades.

Similar letters of reference indicate corresponding parts.

A representsthe eye or hub of the wheel.

B represents the blades.

0 represents the cylinder by which the blades are connected.

The central hub, and the blades of a screw-propeller, connected according to my invention, may be of any usual or convenient form.

The outer ends or tips ot'the blades are connected by a circular flat hoop, band, or cylinder, preferably of about the same width across its periphery as the blades.

The cylinder in my invention is made of tapering form, like the t'rustum of a c0ne,"aud in use is an with the end of lesser diameter for the leading or fore edge.

It has been conclusively demonstrated that the speed of avcssel cannot be increased by using a plain cylinder, 1'. 2., one of-equal diameterat both ends, beyond the speed attained by the ordinary unprotected screw; while, by my improved construction, the volume of water taken in at the fore end of the cylinder is allowed free egress at its wider or rear extremity, the flaring form of the same offering little com parative resistance to the centrifugal force of the water generated during the more or less rapid revolution of the screw, thereby increasing the speed of the Vessel, with the same amount (if power.

The said cylinder can be, cast with the blades and hub, so that the whole may be. in one piece, or it can be attired with rivets or screws, or otherwise fastened.

The tapering form of the cylinder has a tendency to prevent vibration, as the pressure of the water upon it has a different etfcet from what ithas on a true cylinder.

Having thus described my.inventiou,

What I claim as new, .and desire to secure by Letters Patent, is

The propeller-wheel, consisting of the hub A and blades B, when provided with the tapering cylinder 0, substantially as herein shown and described, for purpose set forth.

The above specification of my invention signed by me, this 17th day of, March, 1869.

JAM ES ALBERT -JOYNER.

Witnesses:

FRANK BLocKLnv, ALEX. F. Ronnn'rs. 

